Chen Zhanxing, Ji Jian, Wang Yupeng, Ma Tengfei, Wang Xiaohong, Zhang Xinfang
School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, 450046, China.
Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province, Quzhou University, Quzhou, 324000, China.
Sci Rep. 2025 Apr 3;15(1):11382. doi: 10.1038/s41598-025-95742-z.
In this study, Ti/TiAl laminated composites consisting of Ti layer, α-TiAl interfacial reactive layer, and TiAl layer were successfully prepared by spark plasma sintering using alternately stacking Ti and TiAl powders. The corresponding microstructural evolution and shear strength of the laminated composites were systematically studied. Laminated composites with different intermediate layers (Ti layer, TiAl layer, and TiAl layer) showed different shear fracture behaviors, and the ultimate shear strength of Ti layer, TiAl layer, and TiAl layer reached about 622 MPa, 466 MPa, and 328 MPa, respectively, indicating excellent shear performance. Different interlayer shear tests showed different crack extension behaviors, the main cracks in TiAl intermediate layer propagated along stress direction and penetrated into TiAl layers. The crack growth in TiAl intermediate layers revealed that the main cracks initiated from TiAl layer and extended to the TiAl layer with weak shear strength. When the ductile Ti layer was sheared, the Ti intermediate layer can release the applied shear stress by the plastic deformation and the residual shear force transferred to the TiAl layer forming microcracks. The excellent shear properties of novel Ti/TiAl laminated composite was attributed to the in-situ reaction transition interface.
在本研究中，通过交替堆叠钛粉和钛铝合金粉，利用放电等离子烧结成功制备了由钛层、α-钛铝合金界面反应层和钛铝合金层组成的钛/钛铝合金叠层复合材料。系统研究了叠层复合材料相应的微观结构演变和剪切强度。具有不同中间层（钛层、钛铝合金层和钛铝合金层）的叠层复合材料表现出不同的剪切断裂行为，钛层、钛铝合金层和钛铝合金层的极限剪切强度分别达到约622兆帕、466兆帕和328兆帕，表明其具有优异的剪切性能。不同的层间剪切试验显示出不同的裂纹扩展行为，钛铝合金中间层中的主裂纹沿应力方向扩展并贯穿钛铝合金层。钛铝合金中间层中的裂纹扩展表明，主裂纹从钛铝合金层起始并扩展到剪切强度较弱的钛铝合金层。当韧性钛层受到剪切时，钛中间层可通过塑性变形释放施加的剪切应力，残余剪切力转移到钛铝合金层形成微裂纹。新型钛/钛铝合金叠层复合材料优异的剪切性能归因于原位反应转变界面。
